Boundary Protection Device

A device with appropriate mechanisms that: (i) facilitates the adjudication of different interconnected system security policies (e.g., controlling the flow of information into or out of an interconnected system); and/or (ii) provides information system boundary protection.
SOURCE: SP 800-53

A device with appropriate mechanisms that facilitates the adjudication of different security policies for interconnected systems.
SOURCE: CNSSI-4009